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BMW engine repair questions and answers

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  • AutoMD Member
    AutoMD Member - 2004 BMW Z4 - Engine - 7/16/2014
    My car will not pass the emissions test in Indiana. The OBD is not ready. I was told to drive the car and it should
    reset itself. Is there a test or scan I can try before going back to the Emissions test site?
    0 answer
  • stupage
    stupage - 2003 BMW 325Ci - Engine - 7/12/2014
    How to find the electrical problem keeping the air conditioning compressor from engaging?
    Freon and pressure is good, the fuses and relays are good. The switch panel and coolant temp sensor check ok, system works ok with positive jumper to compressor clutch.
    • alex
      7/12/2014 alex
      first check pressure. after that jump high and low pressure limit switches. power goes from relay through high pressure limit switch then to low pressure switch then to the clutch. pressure is relevant to temp outside but 60 to 100 will make it run should be around 20 when running on the low side 160 to 230 on high side depending on out side air temp.
  • steven
    steven - 2003 BMW 760Li - Engine - 7/8/2014
    Where is the fuel pump relay switch located??
  • starling Hunt
    starling Hunt - 2004 BMW Z4 - Engine - 7/8/2014
    I have white smoke coming out of my tail pipe an car is sluggish
    Car is sluggish blowing white smoke out of tail pipe
    • jdl
      7/8/2014 jdl
      White smoke could mean, coolant getting into combustion chamber, because of faulty head gasket?
    • A&R Auto Center
      7/8/2014 A&R Auto Center
      White smoke 100% mean, coolant getting into combustion chamber, because of faulty head gasket?
  • Michael
    Michael - 1989 BMW 525i - Engine - 7/6/2014
    Car won't start. It only starts up if I put starter fluid in, and then only starts up for a few seconds then shuts off.
    When I replaced the fuel hose I noticed that fuel was going to the fuel pressure regulator but not going anywhere else. So I replaced the fuel pressure regulator now there is fuel running through it. However it still does not start. Battery and starter are brand new.
    0 answer
  • Michael
    Michael - 1989 BMW 525i - Engine - 7/1/2014
    Replaced the fuel pressure regulator, car still does not start.
    Car does start if a shot of starting fluid is used, other wise it won't stay going.
    0 answer
  • beautiful one
    beautiful one - 1996 BMW 318i - Engine - 6/27/2014
    Car wont turn over. Does nothing
    This started when I started my car ( it started fine) but my steering wheel will not unlock so I turned it off hoping it would reset. But it would not start, it did nothing. No noise nothing. When you turn key to start position ( &hold it ) my dash lights and stereo ...
    0 answer
  • AutoMD Member
    AutoMD Member - 2005 BMW X5 - Engine - 6/23/2014
    My car will keep acting like it will start but acts like its not getting gas to roll over completely.
    It will just keep starting with the sound like its going to start but wont. After repeating several times it will start. Then when it runs it doesn't run right and kinda lags like its the fuel filiter or injectors! It will sputter kinda like its not running ...
    0 answer
  • AutoMD Member
    AutoMD Member - 1999 BMW 323i - Engine - 6/22/2014
    I have to start my car 3 or 4 times before it will stay started it will idle up then down and cut off
    When it stays running I have to let it run before taking off sometime it will hesitate in traffic when I stop for the light I was told it is a fuse in the thermostat and the exaust system has to be removed to replace it is this true I don't know about cars I am a ...
    0 answer
  • Michael
    Michael - 1989 BMW 525i - Engine - 6/20/2014
    Car won't turn over. Has a new battery, and a new starter. Just replaced a fuel hose.
    Tried starting vehicle, after several attempts still wouldn't start. On the last attempt i heard the engine make a clunk noise. Now when i turn the key there is nothing.
    0 answer
  • AutoMD Member
    AutoMD Member - 2000 BMW 528i - Engine - 6/18/2014
    Loss of power at low speed. Consumption meter erratic, needle stays at 10l/100km mark even when foot off accelerator.
    Idling erratic when the gear is put to neutral, the RPM goes up to 1000 twice then settles at 500.
    0 answer
  • josh
    josh - 2012 BMW 328i - Engine - 6/16/2014
    Its knocking. What do u do?
    Just knocks. Is it bad?
    0 answer
  • AutoMD Member
    AutoMD Member - 2006 BMW 325xi - Engine - 6/9/2014
    Why is my Bmw overheating?
    I have a 2006 bmw 325xi and is now starting to overheat on me. Before I went replacing parts I went the cheap and quick way first and did a flush with new coolant hoping it would fix it. After I finished and took it on a test drive within minutes the yellow coolant ...
    • Jimm
      5/27/2014 Jimm
      The most common cause of overheating is because of an external leak from a water pump or a radiator or heater hose. The way to find the leak is to wait till it is overnight cold and maybe just pour water in and see if the leak is large enough to see it simply leak out from where it has a leak. if you pour in a half gallon or more and you still see no leak its time to pressure check the system. Rent for free with a deposit from an auto parts chain store like pep boys or auto zone a cooling system pressure tester.

      Here is a short list of possible causes for overheating;

      Low coolant level
      Leaking coolant
      Improper coolant concentration (not at recommended 50 / 50 mix of anti-freeze and water)
      Clogged radiator hoses
      Clogged heater hoses
      Clogged radiator passages
      Clogged heater core
      Faulty thermostat
      Faulty water pump
      Faulty radiator cooling fans
      Faulty radiator cooling fan switch (coolant temperature sensor)
      Faulty / worn serpentine drive belt
      Faulty / worn drive belt tensioner
    • AutoMD Member
      6/9/2014 AutoMD Member
      maybe the weather is high and you let the car run long time
  • Alison
    Alison - 1998 BMW 740iL - Engine - 5/30/2014
    Is it worth spending $8-9K to rebuild the engine on a car this old?
    My car has 195K miles and rides like a dream. The exterior and interior are in excellent shape, and I LOVE this car. However, the mpg isn't great and I'm looking at $8-9K to rebuild the engine in the next 6-12 months. Do I just drive it into the ground, spend the ...
    • bear.1216
      5/30/2014 bear.1216
      The engine may be worth rebuilding. But where did you get that price. $8-9000 is a ridiculous price. At that price you could by a brand new engine, maybe even two engines. You could easily purchase a much newer used car. You should check around for better prices before making a decision. Check your local garages for prices on rebuilding or replacing the engine. Get some more realistic prices. A brand new engine installed at a dealership in my area would cost around $5000. You should also check around for prices on new or remanufactured engine assemblys. Even check for low mileage salvage engines. I dont know your area, but in my area. $9000 buys you a high performance race engine. 3 decent used cars. Or 1 very nice used car. You have some options. If the mpg is your only issue. You may not even need a rebuild. there may be a much simpler fix to the problem.
  • pegasus
    pegasus - 2005 BMW 325xi - Engine - 5/27/2014
    Car hesitates when gas pedal is applied
    The car idles good on parked when I put it in gear it loses powe
    • Jimm
      5/27/2014 Jimm
      First step - have the stored fault codes or check engine light scanned - for free - at any local auto parts store; Advance Auto, Auto Zone, NAPA. Then, post a reply as 'add answer' with the specific code for more assistance. There may be a fault code stored in the OBD memory which may not be displayed as a check engine light.

      Possible Causes of Engine Hesitation or Stumble:

      Dirty fuel injectors (cleaning the injectors often fixes this)
      Dirty air filter (change filter)
      Dirty / clogged fuel filter (change filter)
      Bad MAP (manifold absolute pressure) sensor
      Bad TPS (throttle position) sensor
      Bad or dirty MAF (mass airflow) sensor
      Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
      Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
      Bad gasoline (fuel contaminated with water or too much alcohol)

      Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

      Dirty or worn spark plugs
      Bad plug wires
      Weak ignition coil
      Wet plug wires
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